One of these feedbacks is about ice keeping the planet cold due to its bright white color reflecting sunlight back into space. Another is CO2 because when it's cold the oceans absorb more CO2 which leaves less in the atmosphere to trap heat and when it's warmer the process reverses. In addition to that, ocean currents can also cause regional and global climate change because they act like a giant conveyor belt and spread heat around the Earth. The El Nino influencing the regional pattern of temperature and precipitation changes the global average